(PECL pthreads >= 2.0.0)
A Pool is a container for, and controller of, an adjustable number of Workers.
Pooling provides a higher level abstraction of the Worker functionality, including the management of references in the way required by pthreads.
maximum number of Workers this Pool can use
the class of the Worker
the arguments for constructor of new Workers
references to Workers
references to Threaded objects submitted to the Pool
offset in workers of the last Worker used